Method and apparatus for transmitting information in wireless communication system

Abstract

A method and apparatus for transmitting information in a wireless communication system is provided. A first node receives an indication which indicates that a secondary cell (SCell) is added by a user equipment (UE), and information on the added SCell, and transmits an SCell addition request, including the information on the added SCell and an identity of the UE, to a second node. Alternatively, a method for transmitting information in a wireless communication system is provided. The first node receives an indication which indicates that an SCell is released by a UE, and information on the released SCell, and transmits an SCell release request, including the information on the released SCell and an identity of the UE, to a second node.

What is claimed is: 
     
       1. A method for adding a secondary cell (SCell) in a wireless communication system, the method performed by a user equipment and comprising:
 receiving, from a primary cell (PCell), a list of potential SCells and a SCell addition condition per frequency; 
 measuring one or more SCells; 
 detecting an SCell, which is listed in the list of the potential SCells, among the one or more SCells based on the measurement; 
 adding and deactivating the SCell when the SCell meets the SCell addition condition and the SCell is included in the list of potential SCells; 
 transmitting, to the PCell, an index of the SCell added by the UE and an indication indicating that the SCell is added by the UE; and 
 receiving, from the PCell, a radio resource control (RRC) connection reconfiguration in response to the index and the indication, 
 wherein if the RRC connection reconfiguration indicates that the SCell added by the UE is accepted, the UE activates the SCell added by the UE, and 
 if the RRC connection reconfiguration indicates that the SCell added by the UE is rejected, the UE maintains the deactivation of the SCell added by the UE. 
 
     
     
       2. The method of  claim 1 , wherein the index of the SCell added by the UE is an index not assigned to other configured SCells. 
     
     
       3. The method of  claim 1 , wherein the PCell is controlled by a master eNodeB (MeNB), and the SCell is controlled by a secondary eNodeB (SeNB). 
     
     
       4. The method of  claim 3 , wherein the MeNB and the SeNB are different from each other. 
     
     
       5. The method of  claim 1 , the method further comprising:
 receiving, from the PCell, an indication for activation or deactivation of the SCell added by the UE.